反应详情

温度

2.5 °C

Dry palladium on charcoal (0.54 g, manufactured by Degussa, 5% Pd/C) was added to a solution of methyl 3-Amino-3-(3-pyridyl)-2-propenoate (5.4 g, 30 mmol) in dry acetic acid (13 g) in a 450 ml Pyrex high-pressure bottle. The reaction mixture was hydrogenated at 3-3.2 bar. After 1.5-2 h, the catalyst was filtered and washed with 20 g of isopropyl alcohol until the wash solvent was no longer yellow. Gaseous HCl (10.6 g, 0.3 mol) was bubbled through the stirred filtrate at 5-15° C. The suspension was cooled to 0-5° C. and stirred for two hours. The resulting white precipitate was filtered, washed with 5 g of isopropyl alcohol, and dried at 45° C. to yield 5.95 g (78.4%,) of methyl 3-Amino-3-(3-pyridyl)propanoate dihydrochloride.

1. filtrationthe catalyst was filtered
2. washwashed with 20 g of isopropyl alcohol until the wash solvent
3. filtrationThe resulting white precipitate was filtered
4. washwashed with 5 g of isopropyl alcohol
5. customdried at 45° C.